arch/x86/include/asm/paravirt.h

   1 #ifndef _ASM_X86_PARAVIRT_H
   2 #define _ASM_X86_PARAVIRT_H
   3 /* Various instructions on x86 need to be replaced for
   4  * para-virtualization: those hooks are defined here. */
   5
   6 #ifdef CONFIG_PARAVIRT
   7 #include <asm/pgtable_types.h>
   8 #include <asm/asm.h>
   9
  10 #include <asm/paravirt_types.h>
  11
  12 #ifndef __ASSEMBLY__
  13 #include <linux/bug.h>
  14 #include <linux/types.h>
  15 #include <linux/cpumask.h>
  16 #include <asm/frame.h>
  17
  18 static inline void load_sp0(struct tss_struct *tss,
  19                              struct thread_struct *thread)
  20 {
  21         PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
  22 }
  23
  24 /* The paravirtualized CPUID instruction. */
  25 static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
  26                            unsigned int *ecx, unsigned int *edx)
  27 {
  28         PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
  29 }
  30
  31 /*
  32  * These special macros can be used to get or set a debugging register
  33  */
  34 static inline unsigned long paravirt_get_debugreg(int reg)
  35 {
  36         return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
  37 }
  38 #define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
  39 static inline void set_debugreg(unsigned long val, int reg)
  40 {
  41         PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
  42 }
  43
  44 static inline unsigned long read_cr0(void)
  45 {
  46         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
  47 }
  48
  49 static inline void write_cr0(unsigned long x)
  50 {
  51         PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
  52 }
  53
  54 static inline unsigned long read_cr2(void)
  55 {
  56         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
  57 }
  58
  59 static inline void write_cr2(unsigned long x)
  60 {
  61         PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
  62 }
  63
  64 static inline unsigned long read_cr3(void)
  65 {
  66         return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
  67 }
  68
  69 static inline void write_cr3(unsigned long x)
  70 {
  71         PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
  72 }
  73
  74 static inline unsigned long __read_cr4(void)
  75 {
  76         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
  77 }
  78
  79 static inline void __write_cr4(unsigned long x)
  80 {
  81         PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
  82 }
  83
  84 #ifdef CONFIG_X86_64
  85 static inline unsigned long read_cr8(void)
  86 {
  87         return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
  88 }
  89
  90 static inline void write_cr8(unsigned long x)
  91 {
  92         PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
  93 }
  94 #endif
  95
  96 static inline void arch_safe_halt(void)
  97 {
  98         PVOP_VCALL0(pv_irq_ops.safe_halt);
  99 }
 100
 101 static inline void halt(void)
 102 {
 103         PVOP_VCALL0(pv_irq_ops.halt);
 104 }
 105
 106 static inline void wbinvd(void)
 107 {
 108         PVOP_VCALL0(pv_cpu_ops.wbinvd);
 109 }
 110
 111 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 112
 113 static inline u64 paravirt_read_msr(unsigned msr)
 114 {
 115         return PVOP_CALL1(u64, pv_cpu_ops.read_msr, msr);
 116 }
 117
 118 static inline void paravirt_write_msr(unsigned msr,
 119                                       unsigned low, unsigned high)
 120 {
 121         return PVOP_VCALL3(pv_cpu_ops.write_msr, msr, low, high);
 122 }
 123
 124 static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
 125 {
 126         return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err);
 127 }
 128
 129 static inline int paravirt_write_msr_safe(unsigned msr,
 130                                           unsigned low, unsigned high)
 131 {
 132         return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high);
 133 }
 134
 135 #define rdmsr(msr, val1, val2)                  \
 136 do {                                            \
 137         u64 _l = paravirt_read_msr(msr);        \
 138         val1 = (u32)_l;                         \
 139         val2 = _l >> 32;                        \
 140 } while (0)
 141
 142 #define wrmsr(msr, val1, val2)                  \
 143 do {                                            \
 144         paravirt_write_msr(msr, val1, val2);    \
 145 } while (0)
 146
 147 #define rdmsrl(msr, val)                        \
 148 do {                                            \
 149         val = paravirt_read_msr(msr);           \
 150 } while (0)
 151
 152 static inline void wrmsrl(unsigned msr, u64 val)
 153 {
 154         wrmsr(msr, (u32)val, (u32)(val>>32));
 155 }
 156
 157 #define wrmsr_safe(msr, a, b)   paravirt_write_msr_safe(msr, a, b)
 158
 159 /* rdmsr with exception handling */
 160 #define rdmsr_safe(msr, a, b)                           \
 161 ({                                                      \
 162         int _err;                                       \
 163         u64 _l = paravirt_read_msr_safe(msr, &_err);    \
 164         (*a) = (u32)_l;                                 \
 165         (*b) = _l >> 32;                                \
 166         _err;                                           \
 167 })
 168
 169 static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
 170 {
 171         int err;
 172
 173         *p = paravirt_read_msr_safe(msr, &err);
 174         return err;
 175 }
 176
 177 static inline unsigned long long paravirt_sched_clock(void)
 178 {
 179         return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
 180 }
 181
 182 struct static_key;
 183 extern struct static_key paravirt_steal_enabled;
 184 extern struct static_key paravirt_steal_rq_enabled;
 185
 186 static inline u64 paravirt_steal_clock(int cpu)
 187 {
 188         return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
 189 }
 190
 191 static inline unsigned long long paravirt_read_pmc(int counter)
 192 {
 193         return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
 194 }
 195
 196 #define rdpmc(counter, low, high)               \
 197 do {                                            \
 198         u64 _l = paravirt_read_pmc(counter);    \
 199         low = (u32)_l;                          \
 200         high = _l >> 32;                        \
 201 } while (0)
 202
 203 #define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
 204
 205 static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
 206 {
 207         PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
 208 }
 209
 210 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 211 {
 212         PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
 213 }
 214
 215 static inline void load_TR_desc(void)
 216 {
 217         PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
 218 }
 219 static inline void load_gdt(const struct desc_ptr *dtr)
 220 {
 221         PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
 222 }
 223 static inline void load_idt(const struct desc_ptr *dtr)
 224 {
 225         PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
 226 }
 227 static inline void set_ldt(const void *addr, unsigned entries)
 228 {
 229         PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
 230 }
 231 static inline void store_idt(struct desc_ptr *dtr)
 232 {
 233         PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
 234 }
 235 static inline unsigned long paravirt_store_tr(void)
 236 {
 237         return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
 238 }
 239 #define store_tr(tr)    ((tr) = paravirt_store_tr())
 240 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 241 {
 242         PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
 243 }
 244
 245 #ifdef CONFIG_X86_64
 246 static inline void load_gs_index(unsigned int gs)
 247 {
 248         PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
 249 }
 250 #endif
 251
 252 static inline void write_ldt_entry(struct desc_struct *dt, int entry,
 253                                    const void *desc)
 254 {
 255         PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
 256 }
 257
 258 static inline void write_gdt_entry(struct desc_struct *dt, int entry,
 259                                    void *desc, int type)
 260 {
 261         PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
 262 }
 263
 264 static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
 265 {
 266         PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
 267 }
 268 static inline void set_iopl_mask(unsigned mask)
 269 {
 270         PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
 271 }
 272
 273 /* The paravirtualized I/O functions */
 274 static inline void slow_down_io(void)
 275 {
 276         pv_cpu_ops.io_delay();
 277 #ifdef REALLY_SLOW_IO
 278         pv_cpu_ops.io_delay();
 279         pv_cpu_ops.io_delay();
 280         pv_cpu_ops.io_delay();
 281 #endif
 282 }
 283
 284 static inline void paravirt_activate_mm(struct mm_struct *prev,
 285                                         struct mm_struct *next)
 286 {
 287         PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
 288 }
 289
 290 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 291                                           struct mm_struct *mm)
 292 {
 293         PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
 294 }
 295
 296 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 297 {
 298         PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
 299 }
 300
 301 static inline void __flush_tlb(void)
 302 {
 303         PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
 304 }
 305 static inline void __flush_tlb_global(void)
 306 {
 307         PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
 308 }
 309 static inline void __flush_tlb_single(unsigned long addr)
 310 {
 311         PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
 312 }
 313
 314 static inline void flush_tlb_others(const struct cpumask *cpumask,
 315                                     struct mm_struct *mm,
 316                                     unsigned long start,
 317                                     unsigned long end)
 318 {
 319         PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
 320 }
 321
 322 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
 323 {
 324         return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
 325 }
 326
 327 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
 328 {
 329         PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
 330 }
 331
 332 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
 333 {
 334         PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
 335 }
 336 static inline void paravirt_release_pte(unsigned long pfn)
 337 {
 338         PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
 339 }
 340
 341 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
 342 {
 343         PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
 344 }
 345
 346 static inline void paravirt_release_pmd(unsigned long pfn)
 347 {
 348         PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
 349 }
 350
 351 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
 352 {
 353         PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
 354 }
 355 static inline void paravirt_release_pud(unsigned long pfn)
 356 {
 357         PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
 358 }
 359
 360 static inline void pte_update(struct mm_struct *mm, unsigned long addr,
 361                               pte_t *ptep)
 362 {
 363         PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
 364 }
 365
 366 static inline pte_t __pte(pteval_t val)
 367 {
 368         pteval_t ret;
 369
 370         if (sizeof(pteval_t) > sizeof(long))
 371                 ret = PVOP_CALLEE2(pteval_t,
 372                                    pv_mmu_ops.make_pte,
 373                                    val, (u64)val >> 32);
 374         else
 375                 ret = PVOP_CALLEE1(pteval_t,
 376                                    pv_mmu_ops.make_pte,
 377                                    val);
 378
 379         return (pte_t) { .pte = ret };
 380 }
 381
 382 static inline pteval_t pte_val(pte_t pte)
 383 {
 384         pteval_t ret;
 385
 386         if (sizeof(pteval_t) > sizeof(long))
 387                 ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
 388                                    pte.pte, (u64)pte.pte >> 32);
 389         else
 390                 ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
 391                                    pte.pte);
 392
 393         return ret;
 394 }
 395
 396 static inline pgd_t __pgd(pgdval_t val)
 397 {
 398         pgdval_t ret;
 399
 400         if (sizeof(pgdval_t) > sizeof(long))
 401                 ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
 402                                    val, (u64)val >> 32);
 403         else
 404                 ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
 405                                    val);
 406
 407         return (pgd_t) { ret };
 408 }
 409
 410 static inline pgdval_t pgd_val(pgd_t pgd)
 411 {
 412         pgdval_t ret;
 413
 414         if (sizeof(pgdval_t) > sizeof(long))
 415                 ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
 416                                     pgd.pgd, (u64)pgd.pgd >> 32);
 417         else
 418                 ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
 419                                     pgd.pgd);
 420
 421         return ret;
 422 }
 423
 424 #define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
 425 static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
 426                                            pte_t *ptep)
 427 {
 428         pteval_t ret;
 429
 430         ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
 431                          mm, addr, ptep);
 432
 433         return (pte_t) { .pte = ret };
 434 }
 435
 436 static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
 437                                            pte_t *ptep, pte_t pte)
 438 {
 439         if (sizeof(pteval_t) > sizeof(long))
 440                 /* 5 arg words */
 441                 pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
 442         else
 443                 PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
 444                             mm, addr, ptep, pte.pte);
 445 }
 446
 447 static inline void set_pte(pte_t *ptep, pte_t pte)
 448 {
 449         if (sizeof(pteval_t) > sizeof(long))
 450                 PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
 451                             pte.pte, (u64)pte.pte >> 32);
 452         else
 453                 PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
 454                             pte.pte);
 455 }
 456
 457 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 458                               pte_t *ptep, pte_t pte)
 459 {
 460         if (sizeof(pteval_t) > sizeof(long))
 461                 /* 5 arg words */
 462                 pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
 463         else
 464                 PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
 465 }
 466
 467 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 468                               pmd_t *pmdp, pmd_t pmd)
 469 {
 470         if (sizeof(pmdval_t) > sizeof(long))
 471                 /* 5 arg words */
 472                 pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
 473         else
 474                 PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
 475                             native_pmd_val(pmd));
 476 }
 477
 478 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
 479                               pud_t *pudp, pud_t pud)
 480 {
 481         if (sizeof(pudval_t) > sizeof(long))
 482                 /* 5 arg words */
 483                 pv_mmu_ops.set_pud_at(mm, addr, pudp, pud);
 484         else
 485                 PVOP_VCALL4(pv_mmu_ops.set_pud_at, mm, addr, pudp,
 486                             native_pud_val(pud));
 487 }
 488
 489 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 490 {
 491         pmdval_t val = native_pmd_val(pmd);
 492
 493         if (sizeof(pmdval_t) > sizeof(long))
 494                 PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
 495         else
 496                 PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
 497 }
 498
 499 #if CONFIG_PGTABLE_LEVELS >= 3
 500 static inline pmd_t __pmd(pmdval_t val)
 501 {
 502         pmdval_t ret;
 503
 504         if (sizeof(pmdval_t) > sizeof(long))
 505                 ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
 506                                    val, (u64)val >> 32);
 507         else
 508                 ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
 509                                    val);
 510
 511         return (pmd_t) { ret };
 512 }
 513
 514 static inline pmdval_t pmd_val(pmd_t pmd)
 515 {
 516         pmdval_t ret;
 517
 518         if (sizeof(pmdval_t) > sizeof(long))
 519                 ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
 520                                     pmd.pmd, (u64)pmd.pmd >> 32);
 521         else
 522                 ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
 523                                     pmd.pmd);
 524
 525         return ret;
 526 }
 527
 528 static inline void set_pud(pud_t *pudp, pud_t pud)
 529 {
 530         pudval_t val = native_pud_val(pud);
 531
 532         if (sizeof(pudval_t) > sizeof(long))
 533                 PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
 534                             val, (u64)val >> 32);
 535         else
 536                 PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
 537                             val);
 538 }
 539 #if CONFIG_PGTABLE_LEVELS == 4
 540 static inline pud_t __pud(pudval_t val)
 541 {
 542         pudval_t ret;
 543
 544         if (sizeof(pudval_t) > sizeof(long))
 545                 ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
 546                                    val, (u64)val >> 32);
 547         else
 548                 ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
 549                                    val);
 550
 551         return (pud_t) { ret };
 552 }
 553
 554 static inline pudval_t pud_val(pud_t pud)
 555 {
 556         pudval_t ret;
 557
 558         if (sizeof(pudval_t) > sizeof(long))
 559                 ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
 560                                     pud.pud, (u64)pud.pud >> 32);
 561         else
 562                 ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
 563                                     pud.pud);
 564
 565         return ret;
 566 }
 567
 568 static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
 569 {
 570         pgdval_t val = native_pgd_val(pgd);
 571
 572         if (sizeof(pgdval_t) > sizeof(long))
 573                 PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
 574                             val, (u64)val >> 32);
 575         else
 576                 PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
 577                             val);
 578 }
 579
 580 static inline void pgd_clear(pgd_t *pgdp)
 581 {
 582         set_pgd(pgdp, __pgd(0));
 583 }
 584
 585 static inline void pud_clear(pud_t *pudp)
 586 {
 587         set_pud(pudp, __pud(0));
 588 }
 589
 590 #endif  /* CONFIG_PGTABLE_LEVELS == 4 */
 591
 592 #endif  /* CONFIG_PGTABLE_LEVELS >= 3 */
 593
 594 #ifdef CONFIG_X86_PAE
 595 /* Special-case pte-setting operations for PAE, which can't update a
 596    64-bit pte atomically */
 597 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 598 {
 599         PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
 600                     pte.pte, pte.pte >> 32);
 601 }
 602
 603 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 604                              pte_t *ptep)
 605 {
 606         PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
 607 }
 608
 609 static inline void pmd_clear(pmd_t *pmdp)
 610 {
 611         PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
 612 }
 613 #else  /* !CONFIG_X86_PAE */
 614 static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
 615 {
 616         set_pte(ptep, pte);
 617 }
 618
 619 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 620                              pte_t *ptep)
 621 {
 622         set_pte_at(mm, addr, ptep, __pte(0));
 623 }
 624
 625 static inline void pmd_clear(pmd_t *pmdp)
 626 {
 627         set_pmd(pmdp, __pmd(0));
 628 }
 629 #endif  /* CONFIG_X86_PAE */
 630
 631 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 632 static inline void arch_start_context_switch(struct task_struct *prev)
 633 {
 634         PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
 635 }
 636
 637 static inline void arch_end_context_switch(struct task_struct *next)
 638 {
 639         PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
 640 }
 641
 642 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 643 static inline void arch_enter_lazy_mmu_mode(void)
 644 {
 645         PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
 646 }
 647
 648 static inline void arch_leave_lazy_mmu_mode(void)
 649 {
 650         PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
 651 }
 652
 653 static inline void arch_flush_lazy_mmu_mode(void)
 654 {
 655         PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
 656 }
 657
 658 static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
 659                                 phys_addr_t phys, pgprot_t flags)
 660 {
 661         pv_mmu_ops.set_fixmap(idx, phys, flags);
 662 }
 663
 664 #if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
 665
 666 static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
 667                                                         u32 val)
 668 {
 669         PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
 670 }
 671
 672 static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
 673 {
 674         PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
 675 }
 676
 677 static __always_inline void pv_wait(u8 *ptr, u8 val)
 678 {
 679         PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
 680 }
 681
 682 static __always_inline void pv_kick(int cpu)
 683 {
 684         PVOP_VCALL1(pv_lock_ops.kick, cpu);
 685 }
 686
 687 static __always_inline bool pv_vcpu_is_preempted(long cpu)
 688 {
 689         return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
 690 }
 691
 692 #endif /* SMP && PARAVIRT_SPINLOCKS */
 693
 694 #ifdef CONFIG_X86_32
 695 #define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
 696 #define PV_RESTORE_REGS "popl %edx; popl %ecx;"
 697
 698 /* save and restore all caller-save registers, except return value */
 699 #define PV_SAVE_ALL_CALLER_REGS         "pushl %ecx;"
 700 #define PV_RESTORE_ALL_CALLER_REGS      "popl  %ecx;"
 701
 702 #define PV_FLAGS_ARG "0"
 703 #define PV_EXTRA_CLOBBERS
 704 #define PV_VEXTRA_CLOBBERS
 705 #else
 706 /* save and restore all caller-save registers, except return value */
 707 #define PV_SAVE_ALL_CALLER_REGS                                         \
 708         "push %rcx;"                                                    \
 709         "push %rdx;"                                                    \
 710         "push %rsi;"                                                    \
 711         "push %rdi;"                                                    \
 712         "push %r8;"                                                     \
 713         "push %r9;"                                                     \
 714         "push %r10;"                                                    \
 715         "push %r11;"
 716 #define PV_RESTORE_ALL_CALLER_REGS                                      \
 717         "pop %r11;"                                                     \
 718         "pop %r10;"                                                     \
 719         "pop %r9;"                                                      \
 720         "pop %r8;"                                                      \
 721         "pop %rdi;"                                                     \
 722         "pop %rsi;"                                                     \
 723         "pop %rdx;"                                                     \
 724         "pop %rcx;"
 725
 726 /* We save some registers, but all of them, that's too much. We clobber all
 727  * caller saved registers but the argument parameter */
 728 #define PV_SAVE_REGS "pushq %%rdi;"
 729 #define PV_RESTORE_REGS "popq %%rdi;"
 730 #define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
 731 #define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
 732 #define PV_FLAGS_ARG "D"
 733 #endif
 734
 735 /*
 736  * Generate a thunk around a function which saves all caller-save
 737  * registers except for the return value.  This allows C functions to
 738  * be called from assembler code where fewer than normal registers are
 739  * available.  It may also help code generation around calls from C
 740  * code if the common case doesn't use many registers.
 741  *
 742  * When a callee is wrapped in a thunk, the caller can assume that all
 743  * arg regs and all scratch registers are preserved across the
 744  * call. The return value in rax/eax will not be saved, even for void
 745  * functions.
 746  */
 747 #define PV_THUNK_NAME(func) "__raw_callee_save_" #func
 748 #define PV_CALLEE_SAVE_REGS_THUNK(func)                                 \
 749         extern typeof(func) __raw_callee_save_##func;                   \
 750                                                                         \
 751         asm(".pushsection .text;"                                       \
 752             ".globl " PV_THUNK_NAME(func) ";"                           \
 753             ".type " PV_THUNK_NAME(func) ", @function;"                 \
 754             PV_THUNK_NAME(func) ":"                                     \
 755             FRAME_BEGIN                                                 \
 756             PV_SAVE_ALL_CALLER_REGS                                     \
 757             "call " #func ";"                                           \
 758             PV_RESTORE_ALL_CALLER_REGS                                  \
 759             FRAME_END                                                   \
 760             "ret;"                                                      \
 761             ".popsection")
 762
 763 /* Get a reference to a callee-save function */
 764 #define PV_CALLEE_SAVE(func)                                            \
 765         ((struct paravirt_callee_save) { __raw_callee_save_##func })
 766
 767 /* Promise that "func" already uses the right calling convention */
 768 #define __PV_IS_CALLEE_SAVE(func)                       \
 769         ((struct paravirt_callee_save) { func })
 770
 771 static inline notrace unsigned long arch_local_save_flags(void)
 772 {
 773         return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
 774 }
 775
 776 static inline notrace void arch_local_irq_restore(unsigned long f)
 777 {
 778         PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
 779 }
 780
 781 static inline notrace void arch_local_irq_disable(void)
 782 {
 783         PVOP_VCALLEE0(pv_irq_ops.irq_disable);
 784 }
 785
 786 static inline notrace void arch_local_irq_enable(void)
 787 {
 788         PVOP_VCALLEE0(pv_irq_ops.irq_enable);
 789 }
 790
 791 static inline notrace unsigned long arch_local_irq_save(void)
 792 {
 793         unsigned long f;
 794
 795         f = arch_local_save_flags();
 796         arch_local_irq_disable();
 797         return f;
 798 }
 799
 800
 801 /* Make sure as little as possible of this mess escapes. */
 802 #undef PARAVIRT_CALL
 803 #undef __PVOP_CALL
 804 #undef __PVOP_VCALL
 805 #undef PVOP_VCALL0
 806 #undef PVOP_CALL0
 807 #undef PVOP_VCALL1
 808 #undef PVOP_CALL1
 809 #undef PVOP_VCALL2
 810 #undef PVOP_CALL2
 811 #undef PVOP_VCALL3
 812 #undef PVOP_CALL3
 813 #undef PVOP_VCALL4
 814 #undef PVOP_CALL4
 815
 816 extern void default_banner(void);
 817
 818 #else  /* __ASSEMBLY__ */
 819
 820 #define _PVSITE(ptype, clobbers, ops, word, algn)       \
 821 771:;                                           \
 822         ops;                                    \
 823 772:;                                           \
 824         .pushsection .parainstructions,"a";     \
 825          .align algn;                           \
 826          word 771b;                             \
 827          .byte ptype;                           \
 828          .byte 772b-771b;                       \
 829          .short clobbers;                       \
 830         .popsection
 831
 832
 833 #define COND_PUSH(set, mask, reg)                       \
 834         .if ((~(set)) & mask); push %reg; .endif
 835 #define COND_POP(set, mask, reg)                        \
 836         .if ((~(set)) & mask); pop %reg; .endif
 837
 838 #ifdef CONFIG_X86_64
 839
 840 #define PV_SAVE_REGS(set)                       \
 841         COND_PUSH(set, CLBR_RAX, rax);          \
 842         COND_PUSH(set, CLBR_RCX, rcx);          \
 843         COND_PUSH(set, CLBR_RDX, rdx);          \
 844         COND_PUSH(set, CLBR_RSI, rsi);          \
 845         COND_PUSH(set, CLBR_RDI, rdi);          \
 846         COND_PUSH(set, CLBR_R8, r8);            \
 847         COND_PUSH(set, CLBR_R9, r9);            \
 848         COND_PUSH(set, CLBR_R10, r10);          \
 849         COND_PUSH(set, CLBR_R11, r11)
 850 #define PV_RESTORE_REGS(set)                    \
 851         COND_POP(set, CLBR_R11, r11);           \
 852         COND_POP(set, CLBR_R10, r10);           \
 853         COND_POP(set, CLBR_R9, r9);             \
 854         COND_POP(set, CLBR_R8, r8);             \
 855         COND_POP(set, CLBR_RDI, rdi);           \
 856         COND_POP(set, CLBR_RSI, rsi);           \
 857         COND_POP(set, CLBR_RDX, rdx);           \
 858         COND_POP(set, CLBR_RCX, rcx);           \
 859         COND_POP(set, CLBR_RAX, rax)
 860
 861 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
 862 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
 863 #define PARA_INDIRECT(addr)     *addr(%rip)
 864 #else
 865 #define PV_SAVE_REGS(set)                       \
 866         COND_PUSH(set, CLBR_EAX, eax);          \
 867         COND_PUSH(set, CLBR_EDI, edi);          \
 868         COND_PUSH(set, CLBR_ECX, ecx);          \
 869         COND_PUSH(set, CLBR_EDX, edx)
 870 #define PV_RESTORE_REGS(set)                    \
 871         COND_POP(set, CLBR_EDX, edx);           \
 872         COND_POP(set, CLBR_ECX, ecx);           \
 873         COND_POP(set, CLBR_EDI, edi);           \
 874         COND_POP(set, CLBR_EAX, eax)
 875
 876 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
 877 #define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
 878 #define PARA_INDIRECT(addr)     *%cs:addr
 879 #endif
 880
 881 #define INTERRUPT_RETURN                                                \
 882         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,       \
 883                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))
 884
 885 #define DISABLE_INTERRUPTS(clobbers)                                    \
 886         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
 887                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 888                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);    \
 889                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 890
 891 #define ENABLE_INTERRUPTS(clobbers)                                     \
 892         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,  \
 893                   PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);            \
 894                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);     \
 895                   PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 896
 897 #ifdef CONFIG_X86_32
 898 #define GET_CR0_INTO_EAX                                \
 899         push %ecx; push %edx;                           \
 900         call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
 901         pop %edx; pop %ecx
 902 #else   /* !CONFIG_X86_32 */
 903
 904 /*
 905  * If swapgs is used while the userspace stack is still current,
 906  * there's no way to call a pvop.  The PV replacement *must* be
 907  * inlined, or the swapgs instruction must be trapped and emulated.
 908  */
 909 #define SWAPGS_UNSAFE_STACK                                             \
 910         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 911                   swapgs)
 912
 913 /*
 914  * Note: swapgs is very special, and in practise is either going to be
 915  * implemented with a single "swapgs" instruction or something very
 916  * special.  Either way, we don't need to save any registers for
 917  * it.
 918  */
 919 #define SWAPGS                                                          \
 920         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,     \
 921                   call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)          \
 922                  )
 923
 924 #define GET_CR2_INTO_RAX                                \
 925         call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)
 926
 927 #define PARAVIRT_ADJUST_EXCEPTION_FRAME                                 \
 928         PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
 929                   CLBR_NONE,                                            \
 930                   call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
 931
 932 #define USERGS_SYSRET64                                                 \
 933         PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),       \
 934                   CLBR_NONE,                                            \
 935                   jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))
 936 #endif  /* CONFIG_X86_32 */
 937
 938 #endif /* __ASSEMBLY__ */
 939 #else  /* CONFIG_PARAVIRT */
 940 # define default_banner x86_init_noop
 941 #ifndef __ASSEMBLY__
 942 static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
 943                                           struct mm_struct *mm)
 944 {
 945 }
 946
 947 static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
 948 {
 949 }
 950 #endif /* __ASSEMBLY__ */
 951 #endif /* !CONFIG_PARAVIRT */
 952 #endif /* _ASM_X86_PARAVIRT_H */